33
Ref.
Description
HLD
B
CMN
B
CMN
A
HLD
A
GND
ECU
V
ECU
V
BL
Ref.
Description
GND
DIA
V
DIA
SS
A-
SS
A+
SS
B-
SS
B+
REL
B
1587-
NC
1587+
REL
A
SS
D+
WL
T+
SS
D-
NC
C
SS
C+
SS
C-
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
Valve B, Hold Solenoid
Valve B, Common
Valve A, Common
Valve A, Hold Solenoid
ECU Ground
ECU Continuous Power (with Ignition ON)
Brake Light Power (Secondary Power Source)
No Connection
Warning Light Power, Trailer Mounted
Valve A, Release Solenoid
No Connection
Valve B, Release Solenoid
Diagnostic Port Ground
Diagnostic Port Power (12V)
Speed Sensor A, Negative
Speed Sensor A, Positive
Speed Sensor B, Negative
Speed Sensor B, Positive
Speed Sensor C, Negative
Speed Sensor C, Positive
Speed Sensor D, Negative
Speed Sensor D, Positive
Diagnostic Link, Positive
Diagnostic Link, Negative
X1-CODING A
(GREY)
X2-CODING B
(BLACK)
CMN
CMN
B
HLD
1
2
3
4
5
6
12
11
10
9
8
7
B
A
HLD
A
GND
ECU
V
ECU
WL
REL
T-
REL
B
A
WL
T+
DIAG
V
BL
V
DIA
2
11
1587
+
GND
1
12
DIA
1587
-
SS
3
10
A-
SS
D+
4
9
SS
A+
SS
D-
5
8
SS
B-
SS
C+
6
7
SS
B+
SS
C-
Top–Looking into Harness Connector
STANDARD SYSTEM
ECU
Connector
Cable
Guides
Alignment
Tabs
ECU Cover
Alignment
Tabs
Cover Lock
Ref.
Description
Ref.
Description
SS
A+
SS
A-
CMN
A
HLD
A
GND
ECU
V
ECU
Pin#
Pin#
1
2
3
4
5
6
Speed Sensor A, Positive
Speed Sensor A, Negative
Valve A, Common
Valve A, Hold Solenoid
ECU Ground
ECU Continuous Power (with Ignition ON)
REL
A
SS
B-
SS
B+
DIAG
C
WL
T+
V
BL
7
8
9
10
11
12
Brake Light Power (Secondary Power Source)
Warning Light Power, Trailer Mounted
Diagnostic Plug
Valve A, Release Solenoid
Speed Sensor B, Negative
Speed Sensor B, Positive
X1-CODING C
(GREEN)
SS
A-
2
11
SS
B-
SS
1
12
A+
SS
B+
CMN
3
10
A
REL
A
4
9
HLD
A
DIAG
5
8
GND
ECU
WL
T+
6
7
V
ECU
V
BL
Top–Looking into Harness Connector
BASIC SYSTEM
Cable
Guides
ECU
Connector
ECU Cover
Cover Lock
FIGURE 39 - ECU Pin Identification Chart
